Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Farr Yacht Design projetou barcos para quantos países/bandeiras?
 ###Tabelas: CREATE TABLE former_current_professional_teams (former_current_professional_teams_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Sport VARCHAR, League VARCHAR, Played VARCHAR, Class VARCHAR, Championships VARCHAR) CREATE TABLE participants (participants_id AUTO_INCREMENT PRIMARY KEY, Team & Boat name VARCHAR, Sail no. VARCHAR, Flag VARCHAR, Design Firm VARCHAR, Builder VARCHAR, Skipper VARCHAR) CREATE TABLE former_teams (former_teams_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Sport VARCHAR, League VARCHAR, Established INT, Began in St. Louis INT, Venue VARCHAR, Championships in St. Louis VARCHAR, Left St. Louis INT) CREATE TABLE test_record_partnerships_by_wicket (test_record_partnerships_by_wicket_id AUTO_INCREMENT PRIMARY KEY, Wicket VARCHAR, Runs INT, Batting partners VARCHAR, Batting team VARCHAR, Fielding team VARCHAR, Venue VARCHAR, Season VARCHAR) CREATE TABLE spring_2001 (spring_2001_id AUTO_INCREMENT PRIMARY KEY, 7:00 am VARCHAR, 7:30 am VARCHAR, 8:00 am VARCHAR, 9:00 am VARCHAR, 10:00 am VARCHAR, 11:00 am VARCHAR, noon VARCHAR, 12:30 pm VARCHAR, 1:00 pm VARCHAR, 1:30 pm VARCHAR, 2:00 pm VARCHAR, 3:00 pm VARCHAR, 4:00 pm VARCHAR, 4:30 pm VARCHAR, 5:00 pm VARCHAR, 6:30 pm VARCHAR)  
SELECT COUNT Flag FROM participants WHERE Design Firm = Farr Yacht Design